We're already in that middle ground. Today, you can purchase an SKS from a federally-licensesd dealer after a NCIC background check. You can then take that gun

We're already in that middle ground. Today, you can purchase an SKS from a federally-licensesd dealer after a NCIC background check. You can then take that gun home and replace the magazine with one made in the United States, and no law is broken. Replace it with an identical magazine made in Poland, though, and you've committed a felony under 18 USC § 922(r), and if convicted face up to 10 years in prison. The laws surrounding the ownership of arms in the United States are onerous and Byzantine. I've spent a great deal of effort doing my best to comply with those laws in order to exercise a right that's protected under the federal constitution. Forgive me if I no longer treat "But we can compromise!" as a valid argument.